negative result of sars-cov-2 covid-19 coronavirus rapid antigen ag test done by a nasal swab

negative result sars-cov-2 rapid antigen test nasal swab held medical personnel covid-19 coronavirus isolated blurred background pandemic analyzing care cassette contagion contagious contamination corona global crisis diagnosis diagnostic disease epidemic equipment hand health hospital hubei illustrative infection lab laboratory medicine outbreak patient tested pneumonia sample sars selective focus specimen kit viral virus spread